3 # Copyright 2004 Ian Jackson <ian@chiark.greenend.org.uk>
5 # This script and its documentation (if any) are free software; you
6 # can redistribute it and/or modify them under the terms of the GNU
7 # General Public License as published by the Free Software Foundation;
8 # either version 3, or (at your option) any later version.
10 # chiark-named-conf and its manpage are distributed in the hope that
11 # it will be useful, but WITHOUT ANY WARRANTY; without even the
12 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 # PURPOSE. See the GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License along
16 # with this program; if not, consult the Free Software Foundation's
17 # website at www.fsf.org, or the GNU Project website at www.gnu.org.
26 our $filename= "/usr/share/dict/words";
27 our @randfile= ("/dev/urandom", "/dev/random");
30 sub fail ($) { die "random-word: $_[0]\n"; }
31 open D, ">/dev/null" or fail("open /dev/null: $!");
33 while (@ARGV && $ARGV[0] =~ m/^\-/) {
37 } elsif (m/^\-n(\d+)$/) {
39 } elsif (m/^\-f/ && length > 2) {
41 } elsif (m/^\-F(\d+)$/) {
43 } elsif (m/^\-r/ && length > 2) {
46 open D, ">&STDERR" or fail("dup stderr for debug: $!");
48 fail("unknown option \`$_'");
53 print D "random-word: debug: $_[0]\n"
54 or fail("write debug: $!");
60 for $randfile (@randfile) {
61 $r= new IO::File "$randfile", 'r';
62 debug("open $randfile ".($r ? "ok" : "failed $!"));
64 $!==&ENOENT or fail("cannot open $randfile: $!");
66 $r or fail("could not open any random device: $!\n (tried @randfile)");
69 our $w= new IO::File $filename, 'r';
70 $w or fail("cannot open $filename: $!");
71 debug("open $filename ok");
73 if (defined $filemaxlen) {
74 while (@words < $filemaxlen) {
76 last unless defined $l;
82 $w->error and fail("cannot read $filename: $!");
83 debug("read $filename ok");
86 while (@out < $want) {
88 $!=0; read $r,$rbytes,4;
89 length $rbytes==4 or fail("cannot read $randfile: $!");
90 my $wordno= unpack 'L',$rbytes;
91 $wordno &= ~0x80000000;
95 debug("picked $wordno \`$_'");
96 next unless m/^([a-z][-a-z]+)$/;
98 debug("good, now ".scalar @out);
103 print join(' ',@out), "\n"
104 or fail("cannot write output: $!");